438 Mr. J. S. Baly on new Genera and Species of Phytophaga. 



from India to Southern Australia, Mr. Wallace having sent home 

 many novelties from the Malay archipelago : but I also possess 

 several species from the southern portion of the African conti- 

 nent — thus adding another link to the evidence in favour of the 

 former existence of land in the Indian Ocean. 



Genus SEBiETHE. 



Corpus ovale, modice convexum, lateribus anguste marginatis. 

 Caput ad oculos thoraci insertum, perpeiidiculare ; antennis &\i- 

 formibus, 1 1 -articulatis ; oculis ovatis, vix prominulis ; /acie inter 

 antennas alte carinata. Thorax transversus, dorse non inipressus, 

 lateribus reflexo-marginatis. Elytra subdepressa, confuse punctata, 

 anguste reflexo-marginata ; limbo infiexo concavo, fere horizontali, 

 margine exteriore deorsum pauUo producto. Pedes modice robusti ; 

 femoribus posticis valde incrassatis, subtus canaliculatis ; tibiis })0S- 

 ticis dorso late canaliculatis, apice modice bisinuatis, spina valida 

 acuta armatis ; tarsis posticis apici tibiae insertis, tibise dimidio 

 pauUo longioribus ; unguiculis appendiculatis. Prosternum oblongo- 

 elongatum, latseribus sinuatis. 



Type, Sebcethe badia, Erichs. Manilla. 



The ovate, less convex, and somewhat flattened upper body, 

 the narrowly reflexed lateral border of the thorax, the narrow 

 also reflexed outer margin of the elytra, together with the form 

 of the apex of the hinder tibiae, will serve to distinguish this 

 genus from its allies. 



Genus Arsipoda, Erichs. 



Corpus ovatum aut elongato-ovatum, convexum. Caput modice 

 exsertum ; facie declivi, inter oculos transversim canaliculata ; carina 

 lata, vix aut modice elevata ; antennis 1 1 -articulatis, filiformibus aut 

 subfiliformibus. Thorax transversus, basi utrinque longitudinaliter 

 impressus, plerumque inter impressiones transversim sulcatus, late- 

 ribus anguste marginatis (thoracis impressionibus interdum obsole- 

 tis). Elytra Isevia aut rarius rugulosa, punctato-striata, striis ssepe 

 plus minusve deletis. Pedes mediocres ; coxis anticis transversis, 

 non aut vix elevatis; femoribus posticis valde incrassatis, subtus 

 canaliculatis, d interdum subtus unispinosis ; tibiis ejusdem paris 

 curvatis, extrorsum plus minusve flexuosis, dorso planis aut canalicu- 

 latis, plerumque tricostatis, apice bilobatis, spina valida armatis ; 

 tarsis posticis tibiae apici insertis ; unguiculis appendiculatis. 



Type, Arsipoda Chrysis, Oliv. Australia. 



It will be seen from the above diagnosis that 1 have been 

 obliged to modify slightly the characters of this genus as ori- 

 ginally laid down by Erichson, in order that it may receive 

 a number of allied species which have the strongest affinity with 

 Erichson's type, and form conjointly a most natural generic 

 group. I have drawn up the diagnosis of the genus from A. 

 Lownei, A. Chrysis, and several other species in which all the 

 characters above given are always present ; in some of the other 



